thread

So I screwed my tank too much I guess and then when I was doing my regular cleaning, I screwed off my tank, and it had the thread connecter stuck to it.

So wifey got me an Abaddon mod, worked great until I was out in the field for a week straight and the threads slowly got stripped. I'm looking at ordering heli-coils to repair the mod, however I'm having a hard time finding out for sure what size threading would match up with a 510 connection...